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Auto-forwarding is an email system function that automatically sends received emails to designated mailboxes, facilitating information sharing and management, but requiring safeguards against security risks such as data leakage.

BIMI enhances email credibility by displaying brand logos, reduces phishing fraud, combines with SPF, DKIM, DMARC and other technologies to verify sender identity, increases user trust and suppresses forged emails.

Cloud Email Service (SaaS) is an email solution delivered over the internet, requiring no local deployment, offering advantages in efficiency, flexibility, and security, widely used in enterprise communications, marketing, and customer support.

Edge Transport Server is a key component handling email flow at network boundaries, responsible for security filtering, routing, and transmission, enhancing email system security and efficiency, widely used in enterprise email systems.

Email archiving is a technical means for long-term, secure storage of emails and efficient management, meeting compliance, forensic, and information protection requirements.

Email gateway is the first line of defense for enterprise email systems, with functions including anti-spam, anti-virus, content review, and compliance auditing, ensuring secure and stable email communication.

Email quota is a storage limit set by email service providers to manage resources and ensure service stability. Users need to regularly clean up emails or upgrade accounts to avoid exceeding limits that affect sending/receiving emails and system performance.

Email relay is a critical component in electronic mail transmission, enabling server-to-server email forwarding through the SMTP protocol. Modern systems implement restricted relaying to enhance security, with widespread applications in enterprises, cloud services, and IoT. Future developments are moving toward intelligent and highly secure systems.

Webmail is an online email service accessed through browsers, requiring no client installation, supporting cross-platform multi-device synchronization, with high security and convenience, widely used in personal, enterprise, and educational domains.

Zero Trust Policy is a modern network security concept that emphasizes ’never trust, always verify,’ enhancing security protection through continuous verification, least privilege, multi-factor authentication, and other means.